01 / Location & anatomical relationships
At the front of the lower neck, wrapped around the windpipe.
02 / Structure & organization
Thyroid follicles contain colloid and epithelial cells that synthesize thyroid hormones using iodine. Parafollicular cells form a different endocrine population. The gland is usually arranged as two lobes joined by an isthmus.
03 / Function
Its hormones help set how quickly your body uses energy.
04 / Mechanism
The thyroid releases hormones that influence how cells use energy. Signals from the pituitary help regulate its activity. Thyroid hormones are also important for growth and development, so their effects reach well beyond the neck.
Working together: endocrine system
Hormones travel in the blood to their target cells. Different hormones help guide growth, energy use and changes during puberty.
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Connect structure with function
Hypothalamic and pituitary signals regulate thyroid activity through feedback. Thyroid hormones affect metabolic activity across many tissues rather than acting only in the neck.
Check your understanding
Locate the thyroid in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.